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$ _GET显示空值($_GET shows empty value)

 我有一个test.php ，我有下面的代码  
<?php

    if(isset($_GET['p']) or $_GET['p'] != null) {
        echo $_GET['p'];
    } else {
        echo "Not found";
    }

?>
 
 我列出了下面的URL，然后需要输出显示  
Test 1 : http://localhost/example/test.php
output : Notice: Undefined index: p in R:\xampp\htdocs\example\test.php on line 3
        Not found


Test 2 : http://localhost/example/test.php?p
output : blank page



Test 3 : http://localhost/example/test.php?p=
output : blank page


Test 4 : http://localhost/example/test.php?p=1
output : 1
 
 我接受Test 1和Test 2是true但是当Test 2和Test 3失败了解决方案。 

I have a test.php and i have the below code 
<?php

    if(isset($_GET['p']) or $_GET['p'] != null) {
        echo $_GET['p'];
    } else {
        echo "Not found";
    }

?>
 
I have listed out below urls then required output are show 
Test 1 : http://localhost/example/test.php
output : Notice: Undefined index: p in R:\xampp\htdocs\example\test.php on line 3
        Not found


Test 2 : http://localhost/example/test.php?p
output : blank page



Test 3 : http://localhost/example/test.php?p=
output : blank page


Test 4 : http://localhost/example/test.php?p=1
output : 1
 
I accept that Test 1 and Test 2 are true But when Test 2 and Test 3 fails out the solution.

原文：https://stackoverflow.com/questions/10207796

更新时间：2023-10-29 07:10

最满意答案

 您首先需要#import CAAUParameter和AUParamInfo（ 
 
   可以在/ Developer / Extras / CoreAudio / PublicUtility中找到 
  ）。  
 编辑 ：现在可以在“Audio Tools For Xcode”包中找到这些文件。 您可以通过访问Xcode> Open Developer Tool>更多开发人员工具来获取它...  
 假设您有一个名为theUnit以下代码将设置您迭代theUnit的参数：  
bool includeExpert   = false;
bool includeReadOnly = false;

AUParamInfo info (theUnit, includeExpert, includeReadOnly); 

for(int i = 0; i < info.NumParams(); i++)
{
    if(NULL != info.GetParamInfo(i))
    {
        // Do things with info here
    }
}
 
 例如， info.GetParamInfo(i))->ParamInfo()将为您提供一个AudioUnitParameterInfo结构，其定义如下：  
typedef struct AudioUnitParameterInfo
{
    char                        name[52];
    CFStringRef                 unitName;
    UInt32                      clumpID;
    CFStringRef                 cfNameString;
    AudioUnitParameterUnit      unit;                       
    AudioUnitParameterValue     minValue;           
    AudioUnitParameterValue     maxValue;           
    AudioUnitParameterValue     defaultValue;       
    UInt32                      flags;              
} AudioUnitParameterInfo;
 
 请注意，您首先需要打开AudioUnit（例如，通过在包含该单元的Graph上调用AUGraphOpen（））。 

You'll first need to #import CAAUParameter and AUParamInfo ( 
 
   which can be found in /Developer/Extras/CoreAudio/PublicUtility 
 ). 
EDIT: These files are now found in the "Audio Tools For Xcode" package. You can get it by going to Xcode > Open Developer Tool > More Developer Tools... 
Assuming you have an AudioUnit called theUnit The following code will set you up to iterate through theUnit's parameters: 
bool includeExpert   = false;
bool includeReadOnly = false;

AUParamInfo info (theUnit, includeExpert, includeReadOnly); 

for(int i = 0; i < info.NumParams(); i++)
{
    if(NULL != info.GetParamInfo(i))
    {
        // Do things with info here
    }
}
 
For example, info.GetParamInfo(i))->ParamInfo() will give you an AudioUnitParameterInfo struct which is defined as follows: 
typedef struct AudioUnitParameterInfo
{
    char                        name[52];
    CFStringRef                 unitName;
    UInt32                      clumpID;
    CFStringRef                 cfNameString;
    AudioUnitParameterUnit      unit;                       
    AudioUnitParameterValue     minValue;           
    AudioUnitParameterValue     maxValue;           
    AudioUnitParameterValue     defaultValue;       
    UInt32                      flags;              
} AudioUnitParameterInfo;
 
Note that you'll need to open the AudioUnit first (eg. by calling AUGraphOpen() on the Graph which contains the unit).

$ _GET显示空值($_GET shows empty value)

最满意答案

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